FUJITSU PSWITCH User’s Guide
82 December/2018
Please note that the first VLAN tag in a PBB frame does not use TPID 0x8100 in its
VLAN tag. The Device that switches PBB frames must be configured to recognize
the TPID 0x88A8 VLAN tag.
In the backbone network, all customer frames are encapsulated in the backbone
edge bridge (BEB) and forwarded to another BEB device. The device that switches
the PBB frame of the backbone network is the backbone core bridge (BCB). The
way to encapsulate a frame with PBB header is shown below.
Table 3-3: Frame Encapsulation
The B-tag assignment is determined by the I-tag, and the I-tag assignment is
determined by the customer frame received. This product provides several options
for mapping customer frames to service instances.
BCB devices do not need to be PBB compliant. As B-tag has the same TPID as S-tag,
as long as the device supports TPID 0x88A8 VLAN tag transfer, the encapsulated
frame can be handled as Q-in-Q frame and forwarded to the destination. In order
for the device to act as a BCB, the device enables the VMAN as the primary VLAN
tag with the Double VLAN tunneling feature in order for the device to recognize the
B-tag and forward frames correctly.
3.1.2.15.2. I-domain
The I-domain is similar to the I-component described in IEEE 802.1ah. Create a
virtual network in the switch and manage the FDB table on the customer network.
This virtual network is bridged to the B-domain so that it is encapsulated and
forwarded to the backbone network. This domain is assigned a service instance
identifier (I-SID).
This domain also manages a table of C-MAC mappings to B-MAC. Users can set
static entries and decide how to map these C-MACs. Aging time is the same as
filtering database entries. When the table is full, you can not add new entries and
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